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registry mechanism

This commit is contained in:
Roberto Ierusalimschy 2000-10-24 17:12:06 -02:00
parent e833bd47c9
commit cdc8139e29
3 changed files with 50 additions and 38 deletions
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73
ldblib.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ldblib.c,v 1.22 2000/10/02 20:10:55 roberto Exp roberto $
** $Id: ldblib.c,v 1.23 2000/10/20 16:39:03 roberto Exp roberto $
** Interface from Lua to its debug API
** See Copyright Notice in lua.h
*/
@ -109,58 +109,61 @@ static int setlocal (lua_State *L) {
}
/*
** because of these variables, this module is not reentrant, and should
** not be used in multiple states
*/
static int linehook = LUA_NOREF; /* Lua reference to line hook function */
static int callhook = LUA_NOREF; /* Lua reference to call hook function */
#define KEY_CALLHOOK "dblib_callhook"
#define KEY_LINEHOOK "dblib_linehook"
static void linef (lua_State *L, lua_Debug *ar) {
if (linehook != LUA_NOREF) {
lua_getref(L, linehook);
lua_pushnumber(L, ar->currentline);
static void hookf (lua_State *L, const char *key) {
lua_getregistry(L);
lua_pushstring(L, key);
lua_gettable(L, -2);
if (lua_isfunction(L, -1)) {
lua_pushvalue(L, 1);
lua_call(L, 1, 0);
}
else
lua_pop(L, 1); /* pop result from gettable */
lua_pop(L, 1); /* pop table */
}
static void callf (lua_State *L, lua_Debug *ar) {
if (callhook != LUA_NOREF) {
lua_getref(L, callhook);
lua_pushstring(L, ar->event);
lua_call(L, 1, 0);
}
lua_pushstring(L, ar->event);
hookf(L, KEY_CALLHOOK);
}
static void linef (lua_State *L, lua_Debug *ar) {
lua_pushnumber(L, ar->currentline);
hookf(L, KEY_LINEHOOK);
}
static void sethook (lua_State *L, const char *key, lua_Hook hook,
lua_Hook (*sethookf)(lua_State * L, lua_Hook h)) {
lua_settop(L, 1);
lua_getregistry(L);
lua_pushstring(L, key);
if (lua_isnil(L, 1))
(*sethookf)(L, NULL);
else if (lua_isfunction(L, 1))
(*sethookf)(L, hook);
else
luaL_argerror(L, 1, "function expected");
lua_pushvalue(L, 1);
lua_settable(L, -3);
}
static int setcallhook (lua_State *L) {
lua_unref(L, callhook);
if (lua_isnull(L, 1)) {
callhook = LUA_NOREF;
lua_setcallhook(L, NULL);
}
else {
callhook = lua_ref(L, 1);
lua_setcallhook(L, callf);
}
sethook(L, KEY_CALLHOOK, callf, lua_setcallhook);
return 0;
}
static int setlinehook (lua_State *L) {
lua_unref(L, linehook);
if (lua_isnull(L, 1)) {
linehook = LUA_NOREF;
lua_setlinehook(L, NULL);
}
else {
linehook = lua_ref(L, 1);
lua_setlinehook(L, linef);
}
sethook(L, KEY_LINEHOOK, linef, lua_setlinehook);
return 0;
}

7
lstate.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lstate.c,v 1.44 2000/10/06 19:28:47 roberto Exp roberto $
** $Id: lstate.c,v 1.45 2000/10/20 16:39:03 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
@ -47,16 +47,19 @@ static void f_luaopen (lua_State *L, void *ud) {
stacksize = DEFAULT_STACK_SIZE;
else
stacksize += LUA_MINSTACK;
L->gt = luaH_new(L, 10);
L->gt = luaH_new(L, 10); /* table of globals */
luaD_init(L, stacksize);
luaS_init(L);
luaX_init(L);
luaT_init(L);
lua_newtable(L);
lua_ref(L, 1); /* create registry */
lua_register(L, LUA_ERRORMESSAGE, errormessage);
#ifdef DEBUG
luaB_opentests(L);
if (lua_state == NULL) lua_state = L; /* keep first state to be opened */
#endif
LUA_ASSERT(lua_gettop(L) == 0, "wrong API stack");
}

8
lua.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lua.h,v 1.74 2000/10/09 15:46:43 roberto Exp roberto $
** $Id: lua.h,v 1.75 2000/10/20 16:39:03 roberto Exp roberto $
** Lua - An Extensible Extension Language
** TeCGraf: Grupo de Tecnologia em Computacao Grafica, PUC-Rio, Brazil
** e-mail: lua@tecgraf.puc-rio.br
@ -29,12 +29,16 @@
#define LUA_ERRORMESSAGE "_ERRORMESSAGE"
/* pre-defined references */
#define LUA_NOREF (-2)
#define LUA_REFNIL (-1)
#define LUA_REFREGISTRY 0
/* pre-defined tags */
#define LUA_ANYTAG (-1)
#define LUA_NOTAG (-2)
#define LUA_MULTRET (-1)
@ -198,6 +202,8 @@ LUA_API void lua_concat (lua_State *L, int n);
#define lua_isnil(L,n) (lua_type(L,n) == LUA_TNIL)
#define lua_isnull(L,n) (lua_type(L,n) == LUA_TNONE)
#define lua_getregistry(L) lua_getref(L, LUA_REFREGISTRY)
#endif